Monitoring Particulate Matter in India: Recent Trends and Future Outlook
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Air Quality, Atmosphere & Health https://doi.org/10.1007/s11869-018-0629-6 Monitoring particulate matter in India: recent trends and future outlook Pallavi Pant 1 & RajM.Lal2 & Sarath K. Guttikunda3,4 & Armistead G. Russell2 & Ajay S. Nagpure5 & Anu Ramaswami5 & Richard E. Peltier1 Received: 25 May 2018 /Accepted: 28 September 2018 # Springer Nature B.V. 2018 Abstract Air quality remains a significant environmental health challenge in India, and large sections of the population live in areas with poor ambient air quality. This article presents a summary of the regulatory monitoring landscape in India, and includes a discussion on measurement methods and other available government data on air pollution. Coarse particulate matter (PM10) concentration data from the national regulatory monitoring network for 12 years (2004–2015) were systematically analyzed to determine broad trends. Less than 1% of all PM10 measurements (11 out of 4789) were found to meet the annual average WHO 3 Air Quality Guideline (20 μg/m ), while 19% of the locations were in compliance with the Indian air quality standards for PM10 (60 μg/m3). Further efforts are necessary to improve measurement coverage and quality including the use of hybrid monitoring systems, harmonized approaches for sampling and data analysis, and easier data accessibility. Keywords India . Air quality monitoring . Air pollution policy . WHO Air Quality Guidelines . PM10 . PM2.5 Introduction the global population lives in areas that exceed the World Health Organization (WHO) Air Quality Guidelines, particu- Particulate matter (PM) has been identified as one of the most larly in low- and middle-income countries (van Donkelaar critical environmental risks globally (Brauer et al. 2015)and et al. 2015). PM also has climate effects including its direct poor air quality (AQ) including exposure to PM has been role in light scattering and absorption of sunlight and thermal associated with morbidity and mortality due to respiratory, radiation and the indirect role in acting as cloud condensation cardiovascular, and cerebrovascular diseases (Dockery et al. nuclei (CCN) (Ramanathan and Carmichael 2008), and im- 1993;Dominicietal.2006; Pope and Dockery 2006; Brook pacts visibility and general well-being (Levinson 2012; Singh et al. 2010;Thurstonetal.2016). A significant proportion of et al. 2017; Zhang et al. 2017). Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11869-018-0629-6) contains supplementary material, which is available to authorized users. * Pallavi Pant Richard E. Peltier [email protected] [email protected] Raj M. Lal 1 Department of Environmental Health Sciences, University of [email protected] Massachusetts, 686 North Pleasant St, Amherst, MA 01003, USA Sarath K. Guttikunda 2 School of Civil and Environmental Engineering, Georgia Institute of [email protected] Technology, Atlanta, GA, USA Armistead G. Russell 3 Division of Atmospheric Sciences, Desert Research Institute, 225 [email protected] Raggio Parkway, Reno, NV 89512, USA Ajay S. Nagpure 4 UrbanEmissions.Info, New Delhi, India [email protected] 5 Center for Science, Technology, and Environmental Policy, Hubert Anu Ramaswami H. Humphrey School of Public Affairs, University of Minnesota, [email protected] Minneapolis, MN, USA Air Qual Atmos Health PM2.5 (particulate matter with an aerodynamic diameter matter, i.e., PM with aerodynamic diameter less than 10 μm; now less than 2.5 μm) is the specific fraction of the PM that is typically referred to as PM10), for residential, industrial, and sen- linked with human health impacts, and is often used as an sitive zones. The standards were revised in 2009, including the indicator for air quality within a community, though PM10 promulgation of a uniform standard for PM2.5 concentration (particulate matter with an aerodynamic diameter less than across all location types (http://cpcb.nic.in/National_Ambient_ 10 μm) is also found to have adverse health outcomes Air_Quality_Standards.php)(seeTable1). The standards for 3 3 (Ostro et al. 1999;HEI2011; Stieb et al. 2012;Shahetal. PM2.5,both24h(60μg/m ) and annual (40 μg/m ), are higher 2013). In India, 99.9% of the country’spopulationresidesin than the WHO Air Quality Guidelines (see Table 1), as well as areas that exceed the WHO Air Quality Guideline of 10 μg/m3 standards in the USA and Europe. The following section discusses (annual average), and half of the population resides in areas the major monitoring programmes in the country (see Table 2). where the Indian National Ambient Air Quality Standard 3 (NAAQS) for PM2.5 (40 μg/m ) is exceeded (Greenstone National Air Quality Monitoring Programme et al. 2015; Venkataraman et al. 2018). Per latest Global Burden of Disease (GBD) estimates, the average population- The National Air Quality Monitoring Programme (NAMP) is 3 weighted PM2.5 concentration is 74.3 μg/m , and exposure to the flagship air quality monitoring programme of the outdoor (ambient) air pollution is linked to 133.5 deaths per Government of India. As of September 2018, four key pollut- 100,000 people per year (Cohen et al. 2017). Another study ants—sulfur dioxide (SO2), nitrogen dioxide (NO2), PM10 estimated that exposure to PM2.5 is linked to ~600,000 pre- /RSPM, and PM2.5—are monitored at 703 AQ stations across mature deaths per year in India (Chowdhury and Dey 2016); 307 cities and towns (http://cpcb.nic.in/monitoring-network-3/). the status of epidemiological research with respect to air pol- The program is managed by the CPCB in coordination with the lution is summarized in Gordon et al. (2018). Despite poor air State Pollution Control Boards (SPCBs) and UT (union territo- quality, only a limited amount of data are available on air ry) Pollution Control Committees (PCCs). Other national orga- pollution trends in Indian cities, and there is a significant nizations such as NEERI (National Environmental Engineering gap in our understanding of spatio-temporal patterns of air Research Institute) and regional/local educational institutions pollutants at the local, regional, and national level. Previous are also involved in sample collection and analysis. studies have called for better coverage in terms of air pollution Most of these stations (residential and industrial) are locat- monitoring, as well as better QA/QC (quality assurance/ ed in urban areas, and the coverage in the rural areas is sparse quality control) to ensure high-quality data (Guttikunda et al. (Balakrishnan et al. 2014; Gordon et al. 2018). This is relevant 2014;Greenstoneetal.2015;Pantetal.2016). However, to to note since residential combustion emissions, typically asso- the best of our knowledge, there has been no concerted effort ciated with solid fuel use, are a key source of air pollution to summarize and evaluate existing regulatory AQ monitoring across the country (Balakrishnan et al. 2013; Venkataraman efforts and analyze associated datasets across India in the last et al. 2018). Typically, sampling is conducted twice a week, decade. Furthermore, there is a lack of comprehensive infor- with gas and PM samples collected for 24 h (4-h and 8-h mation on the types of monitoring networks, and associated periods respectively) (http://cpcb.nic.in/monitoring-network- data availability across the country. 3/). Outside of these 4- and 8-h time periods, no data is col- Considering the above issues and gaps, this manuscript lected at the manual stations based on publicly available in- reports on (1) regulatory PM2.5/PM10 data availability and formation. To ensure comparative sampling procedures across key trends throughout India, and (2) current status of the na- the NAMP stations, national guidelines have been set for tional monitoring networks, plans, and limitations in India. monitoring and include information regarding siting criteria, Results of our data analysis and the underlying data are avail- QA/QC procedures, measurement methods, and data able upon request. reporting (CPCB 2003; CPCB 2011). In addition to the mon- itoring sites under NAMP, several states including Maharashtra, Gujarat, Kerala, Odisha, Karnataka, Telangana, Ambient air quality monitoring in India and Andhra Pradesh conduct ambient AQ monitoring at addi- tional sites under State Ambient Air Quality Monitoring Regulatory AQ monitoring, mandatedbytheAir(Preventionand Programme (SAMP). Control of Pollution) Act of 1981, is conducted in India under the The CPCB has also set up a network of continuous moni- aegis of the Central Pollution Control Board (CPCB) which toring stations (Continuous Automatic Air Quality operates under the Ministry of Environment, Forest and Climate Monitoring Station: CAAQMS) across major cities, and a Change (MoEFCC) (Figs. S1, SI). The first set of standards for suite of pollutants including PM (PM2.5 and PM10), gases AQ in India was adopted in 1982 followed by revisions in 1994 (SO2,NO2,NH3, ground-level ozone (O3), CO [carbon mon- and 2009. Originally, there were separate standards for TSP (total oxide]), and BTEX (benzene, toluene, ethylbenzene, and xy- suspended particles) and RSPM (respirable suspended particulate lene) are measured continuously year-round. Currently, cities Air Qual Atmos Health Table 1 Indian National Ambient Air Quality Standards (NAAQS) for fluorescence, GC-MS gas chromatography-mass spectrometry, FRM fed- PM and related components in India (TEOM tapered element oscillating eral reference method, FEM federal equivalent method, lpm liters per microbalance, AAS atomic